Haha...yes...it does depend on the person, like how smart they are and how studious they are.

I started off with a 138, and after 3 months of studying, I was able to get a 159 on my most recent practice test (I've only take a few PTs though...like only 4).

I know someone else who has been studying for 2 years and took both Blue Print and TestMasters, but can't even break a 150. At the same time, he doesn't really use the methods that TM or BP taught him and continues to try and do things "his" way.